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Brain Surgery - Ventriculostomy and Placement of Intracranial Pressure (ICP) Monitor Bolt. Surgical steps following brain injury: A. Incision ino the scalp with a label indicating the hydrocephalus of the brain ventricles, B. Drilling into the frontal area of the skull, C.  Dura opened and an intracranial pressure monitor bolt being inserted, D. Final position of the intracranial pressure monitor bolt with catheter tip residing deep in the ventricle of the brain.